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Meeting Abstracts Downloaded from orbit.dtu.dk on: Oct 08, 2021 Danish activities concerning noise in the environment (A) Ingerslev, Fritz Published in: Acoustical Society of America. Journal Link to article, DOI: 10.1121/1.2019901 Publication date: 1982 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Ingerslev, F. (1982). Danish activities concerning noise in the environment (A). Acoustical Society of America. Journal, 72(S1), S45-S46. https://doi.org/10.1121/1.2019901 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. PROGRAM OF The 104thMeeting of theAcoustical Society of America SheratonTwin Towers ß Orlando,Florida ß 8-12 November1982 TUESDAY MORNING, 9 NOVEMBER 1982 BROWARD AND PALM BEACH ROOMS, 8:00TO 10:15A.M. SessionA.Underwater Acoustics I: The Impact of Satellite and Aerial Remote Sensing onthe Study of Ocean Acoustics Paul D. Scully-Power,Chairman Naval UnderwaterSystems Center, New London, Connecticut 06320 Chairman'sIntroduction4:00 Invited Papers 8:05 A1. Oceanfeatures observed from mannedspacecraft that influenceacoustics in the up•r ocean.Rober• E. Stevenson(Office of NavalResearch, Scripps Institution of Oceanography,A-010, La Jolla,CA 92093) Oceanfronts, eddies, and internalwaves have been observed, photographed, and imagedby synthetic apertureradar during the first four orbital missions of thespace shuttle, Columbia. Supporting data show that thevisual features correspond to thermaldiscontinuities, have significant vertical extensions, act as barriers to underwateracoustics, and can be detected by syntheticaperture radar regardless of skyconditions or timeof day.Although one thinks of thesesea-surface manifestations ashaving a certainubiquity, presently available informationseems to showthat they are concentrated both generically and geographically. This concept is to beaddressed from Columbiaand Challenger during 1983. 8:25 A2. Connectionbetween acoustic and electromagneticsea-surface backscatter. Suzanne T. McDaniel •AppliedResearch Laboratory, The Pennsylvania State University, University Park, PA 16802} Theperformance ofactive high-frequency acoustic systems operating under water is, in manycases, limited bybackscattering from the sea surface. The strength of surfacereverberation has been experimentally found to dependon the speed of the wind driving the ocean waves, while the Doppler spread of the scattered signals has beenrelated to thewaveheight. Electromagnetic sea-surface backscatter may be used to remotelysense the oceansurface and, hence, provides a means of empirically predicting the properties ofacoustic reverberation. Weinvestigate the relationship between acoustic and electromagnetic surface backscatter. The physical me- chanismsresponsible for acousticbackscatter are discussedand the extent to which the relevantoceanic parametersmay be extractedfrom electromagneticbackscatter data is assessed.It is concludedthat electro- magneticremote sensing of theocean surface provides a viable means of predictingboth the strength and Doppler characteristicsof underwaterreverberation. 8:45 A3. Predictionof ambientnoise in the deepocean from surface wind data obtained via satellite.D. Shonting (NavalUnderwater Systems Center, Newport Laboratory, Newport, RI 02840) Openocean measurements at both shallow and deep depths show that ambient acoustic noise above 10-15 kHz increasesnearly linearly as the log of thewind speed. This relationship is studied under a varietyof wind/ seaconditions at 15, 20, and25 kHz bandsusing a newlydeveloped self-contained ambient noise recorder (SCANR).Assessment is made of possibleambient noise prediction from windspeed data obtained from a satellite mounted microwave scatterometer. $1 J. Acoust.Soc. Am. Suppl. 1, Vol. 72, Fall 1982 104th Meeting:Acoustical Society of America $1 Downloaded 27 Jun 2010 to 192.38.67.112. Redistribution subject to ASA license or copyright; see http://asadl.org/journals/doc/ASALIB-home/info/terms.jsp 9:05 A4. Satelliteremote sensing and underwater acoustics: What you see is notnecessarily what you get. Robert F. Henrickand Charles L. Johnson(Johns Hopkins University, Applied Physics Laboratory, Johns Hopkins Road, Laurel,MD 20810) Continuingefforts in satellitesystems and analysis methodology may soon result in routineproduction of oceanweather maps for substantial regions of theworld's oceans. Such maps might illustrate positions of such mesoscalefeatures as ocean fronts and eddies and be available to the acoustician ona routinebasis. (In fact such productsare presently available for the Gulf Streamregion.) However, the use of suchmaps without guidance asto theacoustic significance of these features may have limited utility to an acousticiandeciding on the deploymentofan acoustic system, and may indeed serve to mislead.A frontor eddythat may be clearly visible to a satellitesensor may not be acoustically significant to thesystem under consideration. Even if the mesoscale featurehas acoustic impact, the surfaceexpression of the featuremay not coincidewith the acoustically importantportion of the feature. Alternately, acoustically relevant mesoscale anomalies may not be visible to a satellitesensor. To illustrate these cautions, oceanographic data taken by the U.S. Naval Oceanographic Office OceanMeasurements Program in theNortheast Atlantic and Norwegian Sea are utilized in conjunctionwith numericalacoustic propagation simulations. This region is typical of areaswhere significant mesoscale activity occursand oceanographic sampling is sparse, so that satellite remote sensing may be very useful in predicting acousticsystem performance. However, examples presented illustrate that significantwork must be done beforea usefulsatellite oceanographic product can be turned into a usefulacoustic product. [Work supported by the U.S. Naval OceanographicOffice.] 9:25 AS.SAW's, the connection between space and hydrophones. PaulA. Nysen(Crystal Technology Inc., Palo Alto, CA 94303) SAW(Surface Acoustic Wave} devices are a newclass of signal processing andsignal generating elements nowin usewith radar and communication systems. These devices can be made as filters, delay lines, or resonatorswhich are small, rugged, and inexpensive. This paper discusses the mechanical and thermal sensiti- vitiesof SAW's with a viewtowards using these properties tosense temperature, pressure, and sound in water. Variousmodulation schemes areexamined. Finally abuoy system isexplored, involving agauge string of SAW hydrophones/temperature/pressuresensorswhich can be enabled and interrogated from a spaceplatform. ContributedPapers 9:45 10:00 A6. The use of satellite data for the detection and estimation of large A7. Satellite detection of anomalies in ocean ambient noise? Calvin acoustic anomaliescaused by ocean currents. James V. White and R. Dunlap and Glenn H. Jung (OceanographyDepartment, Naval Robert F. Brammer(The Analytic SciencesCorporation, I JacobWay, PostgraduateSchool, Monterey, CA 93940} Reading, MA 01867) ASTREX (AcousticStorm Response Experiment) observations made The Seasat-A satellite carried a radar altimeter and a microwave scat- in mid-November1980, along a flightline from Cape Mendocino, Califor- terometerthat providednearly global data setson seasurface height, nia, toward the central Gulf of Alaska, includedconcurrent airborne ex- significantwave height, and sea-surface wind velocity.These data, and pendablebathythermograph (AXBT) measurementsof surfaceand sub- similar data from future satellite missions,can be used to estimate ocean surfacetemperatures and ambient noise measurements (1-2000 Hz} using parametersthat effectunderwater sound generation, propogation, and sonobuoys,with hydrophonesdeployed at 400 ft ( 122m}. NOAA-6 satel- surfacescattering. This paperdescribes a matched-filtertechnique for lite infrared observations also were available. It is shown that anomalous usingaltimeter data to detect,locate, and estimate the sizes of largecoher- Ilow}ambient noise values, measured at 122meters and frequencies500- ent acousticanomalies caused by mesoscale(50 kin-500 kin) rotatingcur- 2000 Hz, appearto be associatedwith a warm-coreeddy extending from rent rings.These ring currentsare spawnedby the Gulf Stream,have the surfaceto depthsgreater than 250 m. This thermal featureis shown lifetimesranging from severalmonths to two years,and producecharac- clearlyat the seasurface in a satelliteinfrared photograph. It appearsthat teristicsea-surface height signatures in thealtimeter data. A techniquefor the warm-coreeddy had refractedambient noise away from the hydro- processingthe altimeter data to estimate sound-speed profiles in cold-core phone,since ambient noise levels are severaldecibels higher outside the currentrings is discussed,and resultsfor representativering currentsare eddyregion. It issuggested that
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